A peeing mosquito (seen here) could now reveal what viruses have been in the blood it has drunk. A new trap that collects the pee could lead to easier, cheaper and safer ways to check for lurking human diseases.

This black bear is finding food at a garbage dump. The more a black bear snacks like a human, the more likely that bear is to skimp on hibernation, a new study says. And shorter hibernation might accelerate aging at the cellular level.

Desert kangaroo rats like this one use powerful flying kicks and more to dodge deadly rattlesnake bites.

Brood parasites leave their young with another animal who acts as a “foster parent.” Here, the foster parent is a cape robin-chat (right). It is feeding an enormous chick of another species, a red-chested cuckoo (left).